Granted Patent
Utility
US 6,418,307 · App. 09/448,904
Method and system for delivering a voice mail notification to a subscriber using cellular phone network
Inventor:
Umesh J. Amin
Patented Case
View Patent ↗
Granted: Jul 9, 2002
Filed: Nov 29, 1999
Inventor
Umesh J. Amin
Assignee (at issue)
AT&T WIRELESS SERVICES, INC.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.